US6930258B1 - Multilayer printed wiring board and method of producing multilayer printed wiring board - Google Patents
Multilayer printed wiring board and method of producing multilayer printed wiring board Download PDFInfo
- Publication number
- US6930258B1 US6930258B1 US09/830,963 US83096301A US6930258B1 US 6930258 B1 US6930258 B1 US 6930258B1 US 83096301 A US83096301 A US 83096301A US 6930258 B1 US6930258 B1 US 6930258B1
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- United States
- Prior art keywords
- resin
- holes
- layers
- printed circuit
- circuit board
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime, expires
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Images
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- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/11—Printed elements for providing electric connections to or between printed circuits
- H05K1/111—Pads for surface mounting, e.g. lay-out
- H05K1/112—Pads for surface mounting, e.g. lay-out directly combined with via connections
- H05K1/113—Via provided in pad; Pad over filled via
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- H01L23/488—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor consisting of soldered or bonded constructions
- H01L23/498—Leads, i.e. metallisations or lead-frames on insulating substrates, e.g. chip carriers
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- H01L23/488—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor consisting of soldered or bonded constructions
- H01L23/498—Leads, i.e. metallisations or lead-frames on insulating substrates, e.g. chip carriers
- H01L23/49811—Additional leads joined to the metallisation on the insulating substrate, e.g. pins, bumps, wires, flat leads
- H01L23/49816—Spherical bumps on the substrate for external connection, e.g. ball grid arrays [BGA]
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- H01L23/488—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor consisting of soldered or bonded constructions
- H01L23/498—Leads, i.e. metallisations or lead-frames on insulating substrates, e.g. chip carriers
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- H01L2224/15—Structure, shape, material or disposition of the bump connectors after the connecting process
- H01L2224/16—Structure, shape, material or disposition of the bump connectors after the connecting process of an individual bump connector
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- H01L2924/11—Device type
- H01L2924/12—Passive devices, e.g. 2 terminal devices
- H01L2924/1204—Optical Diode
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- H01L2924/151—Die mounting substrate
- H01L2924/153—Connection portion
- H01L2924/1531—Connection portion the connection portion being formed only on the surface of the substrate opposite to the die mounting surface
- H01L2924/15311—Connection portion the connection portion being formed only on the surface of the substrate opposite to the die mounting surface being a ball array, e.g. BGA
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- H01L2924/151—Die mounting substrate
- H01L2924/153—Connection portion
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- H01L2924/15312—Connection portion the connection portion being formed only on the surface of the substrate opposite to the die mounting surface being a pin array, e.g. PGA
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- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
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- H05K2201/0203—Fillers and particles
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- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/03—Conductive materials
- H05K2201/0332—Structure of the conductor
- H05K2201/0335—Layered conductors or foils
- H05K2201/0347—Overplating, e.g. for reinforcing conductors or bumps; Plating over filled vias
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09209—Shape and layout details of conductors
- H05K2201/095—Conductive through-holes or vias
- H05K2201/09509—Blind vias, i.e. vias having one side closed
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- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09209—Shape and layout details of conductors
- H05K2201/095—Conductive through-holes or vias
- H05K2201/09536—Buried plated through-holes, i.e. plated through-holes formed in a core before lamination
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09209—Shape and layout details of conductors
- H05K2201/095—Conductive through-holes or vias
- H05K2201/0959—Plated through-holes or plated blind vias filled with insulating material
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09209—Shape and layout details of conductors
- H05K2201/095—Conductive through-holes or vias
- H05K2201/096—Vertically aligned vias, holes or stacked vias
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
- H05K2203/07—Treatments involving liquids, e.g. plating, rinsing
- H05K2203/0779—Treatments involving liquids, e.g. plating, rinsing characterised by the specific liquids involved
- H05K2203/0786—Using an aqueous solution, e.g. for cleaning or during drilling of holes
- H05K2203/0796—Oxidant in aqueous solution, e.g. permanganate
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- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/0011—Working of insulating substrates or insulating layers
- H05K3/0055—After-treatment, e.g. cleaning or desmearing of holes
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/0094—Filling or covering plated through-holes or blind plated vias, e.g. for masking or for mechanical reinforcement
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- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
- H05K3/34—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by soldering
- H05K3/3457—Solder materials or compositions; Methods of application thereof
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- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/38—Improvement of the adhesion between the insulating substrate and the metal
- H05K3/381—Improvement of the adhesion between the insulating substrate and the metal by special treatment of the substrate
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- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/38—Improvement of the adhesion between the insulating substrate and the metal
- H05K3/382—Improvement of the adhesion between the insulating substrate and the metal by special treatment of the metal
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- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/40—Forming printed elements for providing electric connections to or between printed circuits
- H05K3/42—Plated through-holes or plated via connections
- H05K3/425—Plated through-holes or plated via connections characterised by the sequence of steps for plating the through-holes or via connections in relation to the conductive pattern
- H05K3/426—Plated through-holes or plated via connections characterised by the sequence of steps for plating the through-holes or via connections in relation to the conductive pattern initial plating of through-holes in substrates without metal
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/40—Forming printed elements for providing electric connections to or between printed circuits
- H05K3/42—Plated through-holes or plated via connections
- H05K3/429—Plated through-holes specially for multilayer circuits, e.g. having connections to inner circuit layers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49117—Conductor or circuit manufacturing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49117—Conductor or circuit manufacturing
- Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
- Y10T29/49126—Assembling bases
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49117—Conductor or circuit manufacturing
- Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
- Y10T29/49155—Manufacturing circuit on or in base
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49117—Conductor or circuit manufacturing
- Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
- Y10T29/49155—Manufacturing circuit on or in base
- Y10T29/49165—Manufacturing circuit on or in base by forming conductive walled aperture in base
Definitions
- the present invention relates to a multi-layer printed circuit board having buildup layers formed on the both sides of a core substrate, the buildup layers each having interlayer resin insulating layers and conductor layers alternately provided, the conductor layers connected to one another by via holes. More particularly, the present invention relates to a multi-layer printed circuit board and a method of manufacturing a multi-layer printed circuit board which can be employed as a package substrate on which IC chips can be mounted.
- a buildup multi-layer printed circuit board has been manufactured by a method disclosed by, for example, Japanese Patent Laid-Open No. 9-130050.
- a rough layer is formed on the surface of the conductor circuit of a printed circuit board by electroless plating or etching. Then, an interlayer insulating resin is applied, exposed and developed by a roll coater or printing, via hole opening portions are formed for making layers continuous, and an interlayer resin insulating layer is formed through UV hardening, actual hardening and the like. Further, a catalyst such as palladium is applied onto the interlayer resin insulating layer on the rough surface which has been subjected to a roughing process with an acid or an oxidizer. A thin electroless plated film is formed, a pattern is formed on the plated film by a dry film and the thickness of the pattern is increased by electroplating. Thereafter, the dry film is separated and removed by an alkali and etched to thereby form a conductor circuit. By repeating the above processes, a buildup multi-layer printed circuit board is obtained.
- the via holes 346 of the lower interlayer resin insulating layer 350 and the via holes 366 of the upper interlayer resin insulating layer 360 are separated from one another under heat cycle conditions.
- the inventor of the present invention investigated the cause of separation and discovered that the via holes 366 in the upper layer are influenced by the shapes of the surfaces of the via holes 346 of the lower layer and the connection characteristic of the via holes 366 deteriorates. Further, it is estimated that since the interlayer resin insulating layers 350 and 360 are not reinforced by core materials such as glass cloth, these layers tend to be separated in a heat cycle rather than a core substrate provided with a core material.
- the present invention has been made to overcome the foregoing problems, and it is, therefore, an object of the present invention to provide a multi-layer printed circuit board and a method of manufacturing a multi-layer printed circuit board capable of shortening internal wiring lengths and having excellent connection reliability.
- a resin is filled in through holes so as to enhance reliability for a buildup multi-layer printed circuit board.
- blackening-reduction processes are conducted to the surfaces of the through holes and rough layers are provided thereon so as to increase adhesiveness.
- through holes are made smaller in size.
- resin filler having low viscosity is employed to be filled in the through holes.
- the resin filler is dented in the through hole, causing disconnection and the like during the formation of wirings on an upper layer.
- the inventor of the present invention investigated the cause of disconnection and discovered that this is because the resin out of filler and the resin which constitute resin filler flow along the rough layer (very small anchor) formed on the land of the through hole. As a result, the filler within the through hole is dented, making it impossible to flatten and smooth a core substrate. Due to this, it was discovered that if manufacturing a multi-layer printed circuit board by forming an interlayer resin insulating layer and wirings on a core substrate, the resultant multi-layer resin insulating layer is susceptible to disconnection and a probability of generating defects increases.
- the present invention has been made to solve the foregoing problems and it is, therefore, a still further object of the present invention to provide a method of manufacturing a multi-layer printed circuit board having enhanced wiring reliability.
- a substrate on which a resin film for the interlayer resin insulating layer of a resin substrate serving as a core material is bonded is employed as a core substrate. Through holes for penetrating the substrate are filled with resin filler. Further, an interlayer resin insulating layer is formed and via holes are formed therein.
- the above-stated resin filler had some defects.
- a multi-layer printed circuit board includes a core substrate having opposite first and second sides, and first and second buildup layers provided on the first and second sides of the core substrate respectively.
- the first buildup layer has first interlayer resin insulating layers and first conductor layers alternately provided.
- the second buildup layer has second interlayer resin insulating layers and second conductor layers alternately provided.
- Each of through holes electrically connects the first conductor layers and the second conductor layers at opposite ends of each of the through holes.
- Each of through hole lands is electrically connected to each of the through holes between the opposite ends of each of the through holes.
- First via holes are provided right on the ends of the through holes to be electrically connected to the through holes.
- Second via holes are provided to be electrically connected to the through hole lands.
- resin filler is filled in the through holes, and the first and second conductor layers are formed to cover exposed surfaces of the resin filler from the through holes.
- the first via holes are formed on the conductor layers.
- FIG. 1 is a diagram showing a process for manufacturing a multi-layer printed circuit board according to the first embodiment of the present invention
- FIG. 2 is a diagram showing a process for manufacturing the multi-layer printed circuit board according to the first embodiment
- FIG. 3 is a diagram showing a process for manufacturing the multi-layer printed circuit board according to the first embodiment
- FIG. 4 is a diagram showing a process for manufacturing the multi-layer printed circuit board according to the first embodiment
- FIG. 5 is a diagram showing a process for manufacturing the multi-layer printed circuit board according to the first embodiment
- FIG. 6 is across-sectional view of the multi-layer printed circuit board according to the first embodiment
- FIG. 7 is a table showing the evaluation results of the first embodiment and Comparison
- FIG. 8 is a diagram showing a process for manufacturing a multi-layer printed circuit board according to the second embodiment of the present invention.
- FIG. 9 is a diagram showing a process for manufacturing the multi-layer printed circuit board according to the second embodiment.
- FIG. 10 is a diagram showing a process for manufacturing the multi-layer printed circuit board according to the second embodiment.
- FIG. 11 is a diagram showing a process for manufacturing the multi-layer printed circuit board according to the second embodiment.
- FIG. 12 is a diagram showing a process for manufacturing the multi-layer printed circuit board according to the second embodiment
- FIG. 13 is a cross-sectional view of the printed circuit board according to the second embodiment.
- FIG. 14 is a diagram showing a process for manufacturing a multi-layer printed circuit board according to the first modification of the second embodiment
- FIG. 15 is a diagram showing a process for manufacturing the multi-layer printed circuit board according to the first modification of the second embodiment
- FIG. 16 is a diagram showing a process for manufacturing the multi-layer printed circuit board according to the first modification of the second embodiment
- FIG. 17 is a diagram showing a process for manufacturing the multi-layer printed circuit board according to the first modification of the second embodiment
- FIG. 18 is a diagram showing a process for manufacturing the multi-layer printed circuit board according to the first modification of the second embodiment
- FIG. 19 is a cross-sectional view of the multi-layer printed circuit board according to the first modification of the second embodiment
- FIG. 20 is a cross-sectional view of the multi-layer printed circuit board according to the second modification of the second embodiment
- FIG. 21 is a table showing the estimation result of the embodiments of the present invention and Comparisons.
- FIG. 22 is a cross-sectional view of a conventional multi-layer printed circuit board.
- FIG. 6 showing a longitudinal sectional view.
- a multi-layer printed circuit board 10 has a core substrate 30 having right and reverse sides on which buildup wiring layers 80 U and 80 D are formed, respectively.
- Each of the buildup wiring layers 80 U and 80 D consists of a lower interlayer resin insulating layer 50 in which via holes 46 are formed, an upper interlayer resin insulating layer 60 in which upper via holes 66 are formed, and a solder resist layer 70 formed on the upper interlayer resin insulating layer 60 .
- a solder bump (external connection terminal) 76 for connecting the board 10 to an IC chip (not shown) is formed on each of the upper via holes 66 through the opening portion 71 of the solder resist 70 .
- a conductive connection pin (external connection terminal) 78 for connecting the circuit board 10 to a daughter board (not shown) is connected to each of the lower via holes 66 .
- through holes 36 connecting the buildup wiring layers 80 U and 80 D to each other are formed to penetrate a core substrate 30 and the lower interlayer resin insulating layers 50 .
- Resin filler 54 is filled in the through holes 36 and plated covers 58 are provided onto the opening portions of the holes 36 .
- resin filler 54 is filled in the via holes 46 formed in the lower inter layer resin insulating layer 50 and plated covers 58 are provided onto the opening portions of the via holes 46 .
- the through holes 36 are formed to penetrate the core substrate 30 and the lower interlayer resin insulating layers 50 and the via holes 66 are formed right on the through holes 36 , respectively. Due to this, each through hole 36 and each via hole 66 are arranged linearly to thereby make it possible to shorten wiring length and to accelerate signal transmission speed. Further, since the through holes 36 are directly connected to the via holes 66 connected to the external connection terminals (solder bumps 76 , conductive connection pins 78 ), excellent connection reliability is obtained.
- the filler 54 filled in the through holes 36 is flattened by polishing and then the plated covers (conductive layers) 58 covering the filler 54 are arranged and the via holes 66 are formed thereon. Due to this, the surfaces of the through holes 36 have high flatness and reliability in the connection between the through holes 36 and the corresponding via holes 66 is excellent.
- the through holes 36 and the lower via holes 46 are filled with the same resin filler 54 and the resin filler 54 is simultaneously polished and flattened as will be described later.
- the multi-layer printed circuit board can be manufactured at low cost and the strength of the interiors of the through holes and that of the interiors of the via holes can be kept uniform, so that the reliability of the multi-layer printed circuit board can be enhanced.
- the filler 54 filled in the via holes 47 is flattened by polishing and then the plated covers (conductive layers) 58 covering the filler 54 are arranged and the upper via holes 66 are formed thereon. Due to this, the surfaces of the lower via holes 46 have high flatness and reliability in the connection between the lower via holes 46 and the upper via holes 66 is excellent.
- a de-smear process for penetrating holes 35 which become the through holes 36 and a roughing process for the surface of the lower interlayer resin insulating layer 40 are performed simultaneously using an oxidizer, so that the number of manufacturing steps can be reduced and the multi-layer printed circuit board can be manufactured at low cost.
- this copper-clad laminated plate is etched in a pattern fashion, thereby forming inner-layer copper patterns 34 on the both sides of the substrate (FIG. 1 (B)).
- the rough layer may be provided by an oxidization-reduction process or by employing an electroless plated alloy.
- the rough layer thus formed has desirably a thickness in a range of 0.1 to 5 ⁇ m. In such a range, the separation between the conductor circuit and the interlayer resin insulating layer less occurs.
- the cupric complex is preferably a cupric complex of azoles.
- the cupric complex of azoles functions as an oxidizer for oxidizing metallic copper or the like.
- Azoles preferably involve diazole, triazole and tetrazole. Particularly, imidazole, 2-methylimidazole, 2-ethylimidazole, 2-ethyl-4-methylimidazole, 2-phenylimidazole, 2-undecylimidazole and the like are preferable.
- the quantity of added cupric complex of azoles is preferably 1 to 15 wt %. This is because the cupric complex of such a quantity is excellent in solubility and stability.
- an organic acid is mixed with the cupric complex of azoles.
- the organic acid is preferably at least one selected from a group consisting of formic acid, acetic acid, propionic acid, butyric acid, valeric acid, caproic acid, acrylic acid, crotonic acid, oxalic acid, malonic acid, succinic acid, glutaric acid, maleic acid, benzoic acid, glycolic acid, lactic acid, malic acid and sulfamic acid.
- An organic acid content is preferably 0.1 to 30 wt %. With this content, it is possible to maintain the solubility of the oxidized copper and to secure stabile solubility.
- the generated cuprous complex is dissolved by the acid, combined with oxygen into a cupric complex which contributes again to the oxidization of copper.
- halogen ions such as fluorine ions, chlorine ions and bromine ions
- the present invention can supply halogen ions by adding hydrochloric acid, sodium chloride or the like.
- the quantity of halogen ions is preferably 0.01 to 20 wt %. Halogen ions of such a quantity ensures excellent adhesiveness between the generated rough surface and the interlayer resin insulating layer.
- cupric complex of azoles and the organic acid (or halogen ions according to necessity) are dissolved in water to thereby adjust the etching solution.
- a commercially available etching solution e.g., product name “MEC etch BOND” manufactured by Mec Co., Ltd., can be employed to form a rough surface according to the present invention.
- a resin film 50 ⁇ which becomes a lower interlayer resin insulating layer is bonded on each surface of the substrate 30 by vacuum crimp lamination at a pressure of 5 kgf/cm 2 while raising temperature to 50 to 150° C. (FIG. 1 (D)).
- the resin film contains refractory resin, soluble particles, a curing agent and other components.
- the materials will now be described.
- the resin film for use in the resin insulating layer in the manufacturing method according to the present invention has a structure that particles soluble in acid or an oxidizer (hereinafter called “soluble particles”) are dispersed in resin which is refractory with respect to acid or an oxidizer (hereinafter called “refractory resin”).
- soluble particles particles soluble in acid or an oxidizer
- refractory resin particles refractory with respect to acid or an oxidizer
- soluble and refractory material When materials are immersed in solution composed of the same acid or the same oxidizers for the same time, a material of a type which is dissolved at a relatively high dissolving rate is called a “soluble” material for convenience. A material of a type which is dissolved at a relatively slow dissolving rate is called a “refractory material” for convenience.
- the soluble particles are exemplified by resin particles which are soluble in acid or an oxidizer (hereinafter called “soluble resin particles”), inorganic particles which are soluble in acid or an oxidizer (hereinafter called “inorganic soluble particles”) and metal particles which are soluble in acid or an oxidizer (hereinafter called “soluble metal particles”).
- soluble resin particles resin particles which are soluble in acid or an oxidizer
- inorganic soluble particles inorganic particles which are soluble in acid or an oxidizer
- metal particles which are soluble in acid or an oxidizer hereinafter called “soluble metal particles”.
- the foregoing soluble particles may be employed solely or two or more particles may be employed.
- each of the soluble particles is not limited.
- the shape may be a spherical shape or a pulverized shape. It is preferable that the particles have a uniform shape. The reason for this lies in that a rough surface having uniformly rough pits and projections can be formed.
- the mean particle size of the soluble particles is 0.1 ⁇ m to 10 ⁇ m.
- particles having two or more particle sizes may be employed. That is, soluble particles having a mean particle size of 0.1 ⁇ m to 0.5 ⁇ m and soluble particles having a mean particle size of 1 ⁇ m to 3 ⁇ mm may be mixed. Thus, a more complicated rough surface can be formed. Moreover, the adhesiveness with the conductor circuit can be improved.
- the particle size of the soluble particles is the length of a longest portion of each of the soluble particles.
- the soluble resin particles may be particles constituted by thermosetting resin or thermoplastic resin. When the particles are immersed in solution composed of acid or an oxidizer, the particles must exhibit dissolving rate higher than that of the foregoing refractory resin.
- the soluble resin particles are exemplified by particles constituted by epoxy resin, phenol resin, polyimide resin, polyphenylene resin, polyolefin resin or fluorine resin.
- the foregoing material may be employed solely or two or more materials may be mixed.
- the soluble resin particles may be resin particles constituted by rubber.
- Rubber above is exemplified by polybutadiene rubber, a variety of denatured polybutadiene rubber, such as denatured epoxy rubber, denatured urethane rubber or denatured (metha) acrylonitrile rubber, and (metha) acrylonitrile butadiene rubber containing a carboxylic group.
- the soluble resin particles can easily be dissolved in acid or an oxidizer. That is, when the soluble resin particles are dissolved with acid, dissolution is permitted with acid except for strong acid. When the soluble resin particles are dissolved, dissolution is permitted with permanganate which has a relatively weak oxidizing power.
- chromic acid When chromic acid is employed, dissolution is permitted even at a low concentration. Therefore, retention of the acid or the oxidizer on the surface of the resin can be prevented.
- a catalyst such as palladium chloride, is supplied after the rough surface has been formed as described later, inhibition of supply of the catalyst and oxidation of the catalyst can be prevented.
- the inorganic soluble particles are exemplified by particles made of at least a material selected from a group consisting of an aluminum compound, a calcium compound, a potassium compound, a magnesium compound and a silicon compound.
- the aluminum compound is exemplified by alumina and aluminum hydroxide.
- the calcium compound is exemplified by calcium carbonate and calcium hydroxide.
- the potassium compound is exemplified by potassium carbonate.
- the magnesium compound is exemplified by magnesia, dolomite and basic magnesium carbonate.
- the silicon compound is exemplified by silica and zeolite. The foregoing material may be employed solely or two or more materials may be mixed.
- the soluble metal particles are exemplified by particles constituted by at least one material selected from a group consisting of copper, nickel, iron, zinc, lead, gold, silver, aluminum, magnesium, potassium and silicon.
- the soluble metal particles may have surfaces coated with resin or the like in order to maintain an insulating characteristic.
- the combination of the two types of soluble particles is combination of resin particles and inorganic particles. Since each of the particles has low conductivity, an insulating characteristic with the resin film can be maintained. Moreover, the thermal expansion can easily be adjusted with the refractory resin. Thus, occurrence of a crack of the interlayer resin insulating layer constituted by the resin film can be prevented. Thus, separation between the interlayer resin insulating layer and the conductor circuit can be prevented.
- the refractory resin is not limited when the resin is able to maintain the shape of the rough surface when the rough surface is formed on the interlayer resin insulating layer by using acid or oxidizer.
- the refractory resin is exemplified by thermosetting resin, thermoplastic resin and their composite material.
- the foregoing photosensitive resin of a type having photosensitive characteristic imparted thereto may be employed. When the photosensitive resin is employed, exposure and development processes of the interlayer resin insulating layers can be performed to form the openings for the via holes.
- the resin containing thermosetting resin is employed.
- the shape of the rough surface can be maintained against plating solution and when a variety of heating processes are performed.
- the refractory resin is exemplified by epoxy resin, phenol resin, phenoxy resin, polyimide resin, polyphenylene resin, polyolefin resin and fluorine resin.
- the foregoing material may be employed solely or two or more types of the materials may be mixed.
- epoxy resin having two or more epoxy groups in one molecule thereof is employed.
- the reason for this lies in that the foregoing rough surface can be formed. Moreover, excellent heat resistance and the like can be obtained. Thus, concentration of stress onto the metal layer can be prevented even under a heat cycle condition. Thus, occurrence of separation of the metal layer can be prevented.
- the epoxy resin is exemplified by cresol novolac epoxy resin, bisphenol-A epoxy resin, bisphenol-F epoxy resin, phenol novolac epoxy resin, alkylphenol novolac epoxy resin, biphenol-F epoxy resin, naphthalene epoxy resin, dicyclopentadiene epoxy resin, an epoxy material constituted by a condensation material of phenol and an aromatic aldehyde having a phenol hydroxyl group, triglycidyl isocyanurate and alicyclic epoxy resin.
- the foregoing material may be employed solely or two or more material may be mixed. Thus, excellent heat resistance can be realized.
- the soluble particles in the resin film according to the present invention are substantially uniformly dispersed in the refractory resin.
- the reason for this lies in that a rough surface having uniform pits and projections can be formed.
- a resin film containing soluble particles in only the surface on which the rough surface is formed may be employed.
- the portions of the resin film except for the surface is not exposed to acid or the oxidizer. Therefore, the insulating characteristic between conductor circuits through the interlayer resin insulating layer can reliably be maintained.
- the amount of the soluble particles which are dispersed in the refractory resin is 3 wt % to 40 wt % with respect to the resin film.
- the amount of mixture of the soluble particles is lower than 3 wt %, the rough surface having required pits and projections cannot be formed.
- the amount is higher than 40 wt %, deep portions of the resin film are undesirably dissolved when the soluble particles are dissolved by using acid or the oxidizer.
- the insulating characteristic between the conductor circuits through the interlayer resin insulating layer constituted by the resin film cannot be maintained. Thus, short circuit is sometimes is caused to occur.
- the resin film contains a curing agent and other components as well as the refractory resin.
- the curing agent is exemplified by an imidazole curing agent, an amine curing agent, a guanidine curing agent, an epoxy adduct of each of the foregoing curing agents, a microcapsule of each of the foregoing curing agents and an organic phosphine compound, such as triphenylphosphine or tetraphenyl phosphonium tetraphenyl borate.
- the content of the curing agent is 0.05 wt % to 10 wt % with respect to the resin film.
- the content is lower than 0.05 wt %, the resin film cannot sufficiently be hardened. Thus, introduction of acid and the oxidizer into the resin film occurs greatly. In the foregoing case, the insulating characteristic of the resin film sometimes deteriorates.
- the content is higher than 10 wt %, an excessively large quantity of the curing agent component sometimes denatures the composition of the resin. In the foregoing case, the reliability sometimes deteriorates.
- the other components are exemplified by an inorganic compound which does not exert an influence on the formation of the rough surface and a filler constituted by resin.
- the in organic compound is exemplified by silica, alumina and dolomite.
- the resin is exemplified by polyimide resin, polyacrylic resin, polyamideimide resin, polyphenylene resin, melanine resin and olefin resin.
- the resin film may contain solvent.
- the solvent is exemplified by ketone, such as acetone, methylethylketone or cyclohexane; aromatic hydrocarbon, such as ethyl acetate, butyl acetate, cellosolve acetate, toluene or xylene.
- ketone such as acetone, methylethylketone or cyclohexane
- aromatic hydrocarbon such as ethyl acetate, butyl acetate, cellosolve acetate, toluene or xylene.
- the foregoing material may be employed solely or two or more materials may be mixed.
- penetrating holes 35 each having a diameter of 300 ⁇ m are formed in the core substrate 30 to which the resin films 50 ⁇ have been bonded, for forming through holes (FIG. 1 (E)).
- Via hole openings 52 each having a diameter of 80 ⁇ m are formed in the resin films 50 ⁇ by applying carbonic acid, excimer, YAG or UV laser (FIG. 2 (A)). Thereafter, the resin films 50 a are thermally hardened to thereby form lower interlayer resin insulating layers 50 .
- the via holes may be formed by an area process using laser or an area process using laser with masks mounted. Alternatively, mixture laser (which means a mixture of, for example, carbonic acid laser and excimer laser) may be employed. Alternatively, both the through holes and the via holes may be formed by using laser.
- an oxidizer consisting of a chromic acid or a permanganate (e.g., potassium permanganate or sodium permanganate) is used to subject the penetrating holes 35 for forming through holes formed in the core substrate 30 and the lower interlayer resin insulating layers 50 to a de-smear process and, at the same time, the surfaces of the lower interlayer resin insulating layers 50 are roughened (FIG. 2 (B)). While temperature for performing these processes is set at 65° C. herein, the processes may be performed at temperature which fall within a range of 40 to 70° C.
- a permanganate e.g., potassium permanganate or sodium permanganate
- the rough surfaces of the interlayer resin insulating layers are formed to have a thickness in a range of 0.5 to 5 mm.
- the thickness in that range can ensure adhesiveness and the interlayer resin insulating layers can be removed in a later step.
- the multi-layer printed circuit board in the first embodiment has the core substrate 30 consisting of one of an FR4 resin, an FR5 resin or a BT resin and has the lower interlayer resin insulating layers 50 containing at least one of an epoxy resin, a phenol resin, a polyimide resin, a polyphenylene resin, a polyolefin resin, a fluorocarbon resin. It is, therefore, possible to simultaneously perform the de-smear process using an oxidizer consisting of a chromic acid and a permanganate to the through holes 35 and the roughing process to the lower interlayer resin insulating layers 50 . Thus, the number of steps is reduced to thereby manufacture the multi-layer printed circuit board at low cost.
- An electroless plated film is formed to have a thickness in a range of 0.1 to 5 ⁇ m. If having a thickness in that range, the electroless plated film can be formed entirely and easily etched away.
- a palladium catalyst is applied to the roughed surfaces of the interlayer resin insulating layers 50 to form electroless copper plated films 42 in an electroless plating solution (FIG. 2 (C)). While the electroless copper plated films are formed herein, copper or nickel coats may be formed by sputtering. Alternatively, the surface layers may be subjected to a plasma, UV or corona process as a drying process. Through the process, the surfaces of the layers 50 are reformed.
- plating resists 43 each having a predetermined pattern are formed (FIG. 2 (D)).
- the substrate is immersed in an electroplating solution to supply an electric current thereto through the electroless copper plated films 42 , thereby forming electroplated copper films 44 (FIG. 2 (E)).
- the plating resists 43 are separated and removed with KOH and the electroless copper plated films 42 under the plating resists are etched away by light etching, thereby forming via holes 46 and through holes 36 each consisting of the electroless copper plated film 42 and the electroplated copper film 44 (FIG. 3 (A)).
- a rough layer (made of an alloy consisting of Cu—Ni—P) 47 is formed in each of the via holes 46 and the through holes 36 by electroless plating (FIG. 3 (B)).
- the rough layer can be formed by etching (e.g., etching by spraying or immersing the holes by or into a solution of a mixture of a cupric complex and an organic acid salt) or by an oxidization-reduction process.
- Resin filler 54 is prepared to have a viscosity of 50 Pa ⁇ S at 23° C., masks having openings according to the diameters of the through holes 36 and the via holes 46 , respectively, are mounted, the resin filler 54 is filled by printing and dried in a drying furnace at a temperature of 100° C. for 20 minutes (FIG. 3 (C)). In the first embodiment, the same filler is simultaneously filled in the through holes 36 and the via holes 46 , so that the number of manufacturing steps can be reduced.
- the following material compositions can be employed:
- protruded resin filler can be removed and flattened only by buffing.
- the advantage of conducting buffing is that various types of particles are contained in the interlayer resin insulating layers and are not scraped away during polishing.
- the resin filler 54 is hardened by conducting a heat process at 100° C. for one hour and at 150° C. for one hour.
- the epoxy resin is not limited to a particular resin, it is preferably at least one selected from a group consisting of bisphenol epoxy resins and novolac resins. This is because if a bisphenol A or F epoxy resin is selected, the viscosity of the resultant mixture can be adjusted without using a dilution solvent. In addition, novolac epoxy resins are excellent in strength, heat resistance and chemical resistance, are not decomposed even in a strong base solution such as electroless plating solution and are not thermally decomposed.
- the bisphenol epoxy resin a bisphenol A epoxy resin or a bisphenol F epoxy resin is preferable.
- the bisphenol F epoxy resin is more preferable because it can be employed with a low viscosity and without using a solvent.
- novolac epoxy resin at least one selected from phenol novolac epoxy resins and cresol novolac epoxy resins is preferable.
- a mixture of a bisphenol epoxy resin and a novolac epoxy resin may be employed.
- a mixture ratio of, for example, the bisphenol epoxy resin to the cresol novolac epoxy resin is preferably 1/1 to 1/100.
- the curing agent contained in the resin filler is not limited to a particular one and a well-known curing agent is available; however, an imidazole curing agent or an amine curing agent is preferable. If such a curing agent is employed, the contraction degree of the filler when the filler is hardened is small and the adhesiveness between the conductor layer constituting the through holes and the resin filler layer is particularly excellent.
- the inorganic particles contained in the resin filler may consist of, for example, aluminum compounds, calcium compounds, potassium compounds, magnesium compounds, silicon compounds and the like. They may be used solely or two or more of them may be employed.
- the aluminum compounds involve, for example, alumina, aluminum hydroxide and the like.
- the calcium compounds involve, for example, calcium carbonate, calcium hydroxide and the like.
- the magnesium compounds involve, for example, magnesia, dolomite, basic magnesium carbonate, talc and the like.
- the silicon compounds involve, for example, silica, zeolite and the like.
- the resin filler contains inorganic particles of 10 to 50 wt %.
- the inorganic particle content in that range allows matching thermal expansion coefficients between the interlayer resin insulating layers. It is more preferable that the resin filler contains inorganic particles of 20 to 40 wt %.
- the shapes of the inorganic particles involve spherical, circular, ellipsoidal, pulverized, polygonal shapes. Among them, the spherical, circular and ellipsoidal shapes are more preferable. This is because these shapes can suppress the occurrence of cracks and the like resulting from particle shapes. Further, the particles may be coated with a silica coupling agent. By doing so, the adhesiveness between the inorganic particles and the epoxy resin improves.
- a rough surface is formed on at least part of the surface of the conductor layers constituting the through holes. If so, the adhesiveness between the conductor layers and the resin filler layers further improves and expansion and contraction in a heat history can be suppressed to thereby make it more difficult to separate the conductor layers from the resin filler layers.
- the mean roughness of the rough surface is preferably 0.05 to 5 ⁇ m. If the mean roughness is less than 0.05 ⁇ m, the effect of roughing the surfaces of the conductor layers is hardly obtained. If the mean roughness exceeds 5 ⁇ m, signal delays and signal errors resulting from a skin effect at the time of signal transmission may possibly occur.
- the resin filler may contain not only the epoxy resin but also other thermosetting resins, thermoplastic resins, photosensitive resins, complexes thereof or the like.
- thermosetting resins involve, for example, apolyimide resin and a phenol resin.
- the thermoplastic resins involve, for example, a fluorocarbon resin such as polytetrafluoroethylene (PTFE), tetrafluoroethylene/hexafluoropropylene copolymer (fluorinated ethylene propylene) (FEP) and tetrafluoroethylene/perphloroalkoxy copolymer (PFA), polyethylene terephthalate (PET), polysulfone (PSF), polyphenylene sulfide (PPS), thermoplastic polyphenylene ether (PPE), polyether sulfone (PES), polyetherimide (PEI), polyphenylene sulfone (PPES), polyethylene naphthalate (PEN), poly(ether ether ketone) (PEEK), polyolefin and phenoxy resins.
- PTFE polytetrafluoroethylene
- FEP fluorinated ethylene
- the photosensitive resins involve, for example, acrylic resins by adding a (meta) acrylic acid having photosensitive groups to part of thermosetting resins.
- resins may be used solely or two or more resins may be employed.
- epoxy resin these resins or complexes thereof (i.e., a complex of a thermosetting resin and a thermoplastic resin or a complex of a photosensitive resin and a thermoplastic resin) may be employed.
- resin particles, metallic particles and the like other than the inorganic particles may be mixed with the resin filler.
- the resin particles involve those obtained by sphering thermosetting resins, thermoplastic resins and the like.
- the metallic particles involve conductive particles such as gold, silver and copper particles and the like. They may be used solely or two types or more particles may be employed. Alternatively, they may be employed instead of the inorganic particles.
- the resin filler may contain a solvent such as NMP (N-methylpyrrolidone), DMDG (diethylene glycol dimethyl ether), glycerol, cyclohexanol, cyclohexanone, methyl cellosolve, methyl cellosolve acetate, methanol, ethanol, butanol or propanol, (solvent-impregnated type); however, it is more preferable that the resin filler contains no solvent (non-solvent-containing type). This is because air bubble is less left in the through holes and the like after hardening the resin filler if the resin filler contains no solvent. If air bubble is left, reliability and connection characteristics deteriorate.
- a solvent such as NMP (N-methylpyrrolidone), DMDG (diethylene glycol dimethyl ether), glycerol, cyclohexanol, cyclohexanone, methyl cellosolve, methyl cellosolve acetate, methanol,
- a palladium catalyst is applied to the surfaces of the interlayer resin insulating layers 50 to thereby form electroless copper plated films 56 in an electroless plating solution (FIG. 4 (A)). While the electroless copper plated films are formed herein, copper or nickel coats can be formed by sputtering. In some cases, electroplating can be directly performed to the interlayer resin insulating layers 50 .
- plating resists (not shown) each having a predetermined pattern
- electroplated copper films 57 are formed.
- the plating resists are separated and removed and the electroless copper plated films 56 under the plating resist are separated by light etching, thereby forming plated covers 58 each consisting of the electroless copper plated film 56 and the electroplated copper film 57 in the opening portions of the via holes 46 and the through holes 36 , respectively (FIG. 4 (B)).
- Rough layers (Cu—Ni—P) are formed on the plated covers 58 provided on the openings of the via holes 46 and the through holes 36 by electroless plating, respectively (FIG. 4 (C)).
- the rough layers can be formed by etching or an oxidization-reduction process instead of the electroless copper plating.
- solder resists and solder bumps are formed.
- the material composition of the solder resist is as follows.
- oligomer having a molecular weight of 4000 which is obtained by forming 50% of epoxy groups of 60 wt % cresol novolac epoxy resin (manufactured by Nippon Kayaku) dissolved in DMDG into an acrylic structure and which imparts photosensitive characteristic
- solder resist layers various types of resins may be used.
- a resin obtained by hardening a bisphenol A epoxy resin, a bisphenol A epoxy acrylate resin, a novolac epoxy resin or a novolac epoxy acrylate resin by an amine curing agent, an imidazole curing agent or the like can be used.
- a resin containing “a novolac epoxy resin or a novolac epoxy acrylate resin” and containing “an imidazole curing agent” is preferable to use as a curing agent.
- the above solder resist composition 70 a is applied to each side of the multi-layer printed circuit board obtained in the step (17) to have a thickness of 40 ⁇ m (FIG. 5 (A)).
- a drying process is performed at 70° C. for 20 minutes and at 80° C. for 30 minutes. Thereafter, a photomask film which has a thickness of 5 mm and on which a circular pattern (mask pattern) drawn is made hermetic contact with the both sides of the resultant multi-layer printed circuit board, mounted thereon, exposed with ultraviolet rays with 1000 mj/cm 2 and subjected to a DMTG development process. Further, a heat process is performed on conditions of 80° C. for one hour, 100° C. for one hour, 120° C. for one hour and 150° C. for three hours, to thereby form solder resist layers 70 (a thickness of 20 ⁇ m) each having opening portions 71 (an opening diameter of 200 ⁇ m) (FIG. 5 (B)).
- a nickel plated layer 72 having a thickness of 5 ⁇ m is formed in each opening portion 71 .
- the multi-layer printed circuit board is immersed in an electroless gold plating solution composed of 7.6 ⁇ 10 ⁇ 3 mol/l gold potassium cyanide, 1.9 ⁇ 10 ⁇ 1 mol/l ammonia chloride, 1.2 ⁇ 10 ⁇ 1 mol/l sodium citrate and 1.7 ⁇ 10 ⁇ 1 mol/l sodium hypophosphite on conditions of 80° C. for 7.5 minutes.
- gold plated layers 74 each having a thickness of 0.03 ⁇ m are formed on the nickel plated layers 72 , respectively (FIG. 5 (C)).
- the intermediate layer is formed out of nickel and the noble metal layer out of gold.
- the intermediate layer may be formed out of palladium, tin or titanium instead of nickel and the noble metal layer may be formed out of silver, platinum or the like other than gold.
- Two or more noble metal layers may be formed.
- a drying process, a plasma process, a UV process and a corona process may be performed. By doing so, it is possible to enhance the filling efficiency of the under-filler for the IC chip.
- solder paste is printed on each opening 71 of the solder resist layer 70 and a reflow process is conducted to thereby form a solder bump (solder) 76 in each of the upper surface-side via holes 66 .
- solder bump solder
- a conductive connection pin 78 is attached to each of the lower surface-side via holes 66 through the solder 77 (see FIG. 6 ). It is also possible to form a BGA instead of the conductive connection pin.
- solder As the solder, Sn/Pb, Sn/Sb, Sn/Ag, Sn/Sb/Pb, Sn/Ag/Cu and the like may be used.
- the melting point of the solder is preferably 180 to 280° C.
- the solder having the melting point in that range can ensure that the conductive connection pin has a strength of 2.0 Kg/pin or higher. If the melting point is lower than that range, the strength of the pin decreases. If exceeding the range, the solder resist layer may possibly be dissolved. It is particularly preferable that the melting point of the solder is 200 to 260° C.
- the melting point of the solder at the conductive connection pin side is higher than that of the solder at the solder bump side. By doing so, conductive connection pins are not inclined or detached during reflow if an IC chip is mounted as a flip chip.
- a combination of solders is, for example, Sn/Pb at the solder bump side and Sn/Sb at the conductive connection pin side.
- a multi-layer printed circuit board was obtained which board is the same in constitution as the multi-layer printed circuit board in the first embodiment shown in FIG. 1 and which has lower via holes filled with copper plated layer.
- the evaluation results of the multi-layer printed circuit board in the first embodiment and that in the comparison example 1 are shown in FIG. 7 .
- a multi-layer printed circuit board was obtained which board is the same in constitution as the multi-layer printed circuit board in the first embodiment shown in FIG. 6 and which has the resin filler used in the first embodiment and filled in through holes and has a metal paste mainly consisting of a silver paste and filled in via holes.
- the coefficient of the thermal expansion of the via holes 66 filled with the metal paste greatly differed from that of the through holes 26 filled with the resin filler. Due to this, a force transferred to the lower interlayer resin insulating layers 50 from the lateral direction varies and the interlayer resin insulating layers 50 expanded or separated from a core substrate 30 . In the embodiment stated above, by contrast, the separation of the lower interlayer resin insulating layers 50 did not occur.
- a comparison example 3 is almost the same as the first embodiment except that the quantity of mixed silica was 271 parts by weight and that the mixture ratio of inorganic particles to resin filler was 71.5 wt %.
- a comparison example 4 is almost the same as the first embodiment except that the quantity of mixed silica was 5.7 parts by weight and that the mixture ratio of inorganic particles to resin filler was 5.0 wt %.
- FIG. 13 is a cross-sectional view of a printed circuit board 110 .
- the printed circuit board 110 consists of a core substrate 130 and buildup wiring layers 180 A and 180 B.
- Each of the build up wiring layers 180 A and 180 B consists of interlayer resin insulating layers 150 and 160 .
- Via holes 146 and conductor circuits 145 are formed on the interlayer resin insulating layers 150 .
- Via holes 166 and conductor circuits 165 are formed on the interlayer resin insulating layers 160 .
- Solder resist layers 170 are provided on the respective interlayer resin insulating layers 160 .
- a copper-clad laminated plate 130 A having copper foils 132 each having a thickness of 18 ⁇ m and laminated on the both sides of a substrate 130 having a thickness of 0.8 mm and made of a glass epoxy resin or a BT (Bismaleimide-Triazine) resin is employed as a starting material (FIG. 8 (A)).
- this copper-clad laminated plate 130 A is drilled, subjected to an electroless plating process and etched in a pattern fashion, thereby forming lower conductor circuits 134 and through holes 136 on the both sides of the substrate 130 (FIG. 8 (B)).
- the roughing process may be surface roughing or the like by conducting soft etching, by forming a needle-type alloy plated material consisting of copper-nickel-phosphorous (Interplate manufactured by EBARA UDYLITE Co., Ltd.) or by using an etching solution such as “MEC etch BOND” manufactured by Mec Co., Ltd.
- the layers of resin filler 154 are formed on portions on which the lower conductor circuits 134 are not formed using a squeegee and dried on conditions of 100° C. for 20 minutes (FIG. 9 (B)).
- the resin filler 154 it is preferable to employ one selected from a mixture of an epoxy resin and organic filler, a mixture of an epoxy resin and inorganic filler and a mixture of an epoxy resin and inorganic fiber.
- the resin filler in the first embodiment may be employed.
- the surface portion of the resin filler 154 filled between the lower conductor circuits 134 and in the through holes 136 and the rough surfaces 134 ⁇ on the upper surfaces of the lower conductor circuits 134 are removed to thereby flatten the both sides of the substrate.
- the resin filler 154 and, the lower conductor circuits 134 and the through holes 136 are fixedly bonded through the rough layers 134 ⁇ and 136 ⁇ .
- the substrate 130 After washing the substrate 130 and degreasing the substrate 130 with an acid, the substrate 130 is subjected to soft etching and an etching solution is sprayed on the both sides of the substrate 130 to etch the surfaces of the lower conductor circuits 134 and the surfaces of the lands 136 a of the through holes 136 , thereby forming rough surfaces 134 ⁇ on the entire surfaces of the lands 136 a of the through holes 136 and the lower conductor circuits 134 (FIG. 9 (D)).
- etching solution an etching solution containing 10 parts by weight of imidazole copper (II) complex, 7 parts by weight of a glycolic acid and 5 parts by weight of potassium chloride (MEC etch BOND manufactured by Mec Co., Ltd.)
- Each of the rough layers thus formed preferably has a thickness in a range of 0.1 to 5 ⁇ m. In that range, the separation between the conductor circuits and the interlayer resin insulating layers less occurs.
- Resin films for forming interlayer resin insulating layers slightly larger than the substrate 130 manufactured in A are mounted on the both sides of the substrate 130 , temporarily pressed on conditions of a pressure of 4 kgf/cm 2 , a temperature of 80° C. and a press duration of 10 seconds and cut. Then, the resin films are bonded using a vacuum laminator device by the following method, thereby forming interlayer resin insulating layers 150 on the both sides of the substrate 130 (FIG. 10 (A)). Namely, the resin films for forming the interlayer resin insulating layers are actually pressed on the both sides of the substrate on conditions of the degree of vacuum of 0.5 Torr, a pressure of 4 kgf/cm 2 , a temperature of 80° C. and a press duration of 60 seconds and then thermally hardened at 170° C. for 30 minutes.
- via hole openings 152 each having a diameter of 80 ⁇ m are formed on the interlayer resin insulating layers 150 through masks 151 each having a thickness of 1.2 mm and having penetrating holes 151 a formed therein, by using CO 2 gas laser at a wavelength of 10.4 ⁇ m on conditions of a beam diameter of 4.0 mm, a top-hat mode, a pulse width of 8.0 microseconds, the diameter of each penetrating hole 151 a of the masks 151 of 1.0 mm and one shot (FIG. 10 (B)).
- the substrate 130 having the via hole openings 152 formed therein is immersed in a solution containing 60 g/l of a permanganate acid at a temperature of 80° C. and epoxy resin particles existing on the surfaces of the interlayer resin insulating layers 150 are dissolved and removed, thereby forming rough surfaces 150 ⁇ on the surfaces of the interlayer resin insulating layers 150 including the inner walls of the via hole openings 152 (FIG. 10 (C)).
- the rough surfaces of the interlayer resin insulating layers are formed to have a thickness in a range of 0.5 to 5 ⁇ m. In that range, adhesiveness can be ensured and the conductor layers can be removed in a later step.
- the substrate 130 is immersed in a neutral solution (manufactured by Siplay) and washed.
- a palladium catalyst is applied to the surfaces of the substrate 130 which surfaces have been roughed (with a rough depth of 3 ⁇ m), thereby attaching catalyst cores on the surfaces of the interlayer resin insulating layers 150 and the inner wall surfaces of the via hole openings 152 .
- the substrate 130 is immersed in an electroless copper plating solution having the following composition to form electroless copper plated films 156 each having a thickness of 0.5 to 5.0 ⁇ m on the entire rough surfaces 150 ⁇ (FIG. 10 (D)).
- the electroless plated films 156 under the plating resists 155 are etched with a solution mixture of a sulfuric acid and hydrogen peroxide to remove and dissolve the films 156 , thereby forming conductor circuits 145 (including via holes 146 ) each consisting of the electroless copper plated film 156 and the electroplated copper film 157 and having a thickness of 18 ⁇ m (FIG. 11 (B)).
- solder resist composition is applied to each side of the substrate 130 to have a thickness of 20 ⁇ m and dried. Then, a photomask is closely attached to each solder resist layer 170 , exposed to ultraviolet rays, developed with a DMTG solution to form openings 171 U and 171 D each having a diameter of 200 ⁇ m. Thereafter, a heating process is performed to harden the solder resist layers 170 to thereby provide the solder resist layers 170 each having openings 171 U and 171 D and each having a thickness of 20 ⁇ m (FIG. 12 (A)).
- the solder resist composition may be a commercially available solder resist composition.
- the substrate 130 having the solder resist layers 170 formed thereon is immersed in the same electroless nickel plating solution as that employed in the first embodiment and then immersed in an electroless gold plating solution, thereby forming a nickel plated layer 172 and a gold plated layer 174 in each of the openings 171 U and 171 D (FIG. 12 (B)).
- solder paste containing tin-lead is printed on each opening 171 U of the solder resist layers 170 of the substrate 130 . Further, a solder paste as a conductive adhesive agent 197 is printed on each opening 171 at the other side of the substrate.
- conductive connection pins 178 are attached to and supported by an appropriate pin holding device and the fixed portions 198 of the respective conductive connection pins 178 are brought into contact with the conductive adhesive agent 197 within the openings 171 D. A reflow process is then performed to fix each conductive connection pin 178 to the conductive adhesive agent 197 .
- the conductive adhesive agent 197 may be formed into a ball shape or the like and put in the openings 171 D, or the conductive adhesive agent 197 may be joined to the fixed portions 198 to attach the conductive connection pins 178 , followed by a reflow process. By doing so, it is possible to obtain a printed circuit board 110 having the solder bumps 176 and the conductive connection pins 178 (FIG. 13 ).
- a printed circuit board 120 according to the first modification of the second embodiment of the present invention will be described hereinafter with reference to FIG. 19 .
- a PGA method for establishing connection through the conductive connection pins 178 as shown in FIG. 13 has been described.
- the first modification of the second embodiment is almost the same in constitution as the second embodiment except that bumps 176 at a daughter board side are connected to the daughter board by a BGA method.
- a copper-clad laminated plate 130 A having copper foils 132 each having a thickness of 18 ⁇ m and laminated on the both sides of a substrate 130 having a thickness of 1 mm and made of a glass epoxy resin or a BT (Bismaleimide-Triazine) resin is employed as a starting material (FIG. 14 (A)).
- this copper-clad laminated plate 130 A is drilled and then a plating resist is formed. Thereafter, the substrate 130 is subjected to an electroless copper plating process to form through holes 136 and the copper foils 132 are etched in a pattern fashion according to an ordinary method, thereby forming lower conductor circuits 134 on both sides of the substrate 130 (FIG. 14 (B)).
- an etching solution is sprayed on the both sides of the substrate 130 and the surfaces of the lower conductor circuits 134 , the inner walls of the through holes 136 and the surfaces of lands 136 a are etched, thereby forming rough layers 134 ⁇ and 136 ⁇ on the entire surfaces of the lower conductor circuits 134 including the through holes 136 (FIG. 14 (C)).
- a solution mixture of 10 parts by weight of imidazole copper (II) complex, 7 parts by weight of a glycolic acid, 5 parts by weight of potassium chloride and 78 parts by weight of ion-exchange water is employed.
- the roughing process may be performed by conducting soft etching, by conducting a blackening (oxidization)-reduction process or by forming a needle alloy plated material (Interplate manufactured by EBARA UDYLITE Co., Ltd.) consisting of copper-nickel-phosphorous or the like.
- a mask 139 having opening portions 139 a corresponding to the respective through holes 136 is mounted on the substrate 130 and resin filler 154 mainly consisting of an epoxy resin is applied using a printer (FIG. 15 (A)).
- resin filler 154 mainly consisting of an epoxy resin is applied using a printer (FIG. 15 (A)).
- the step of ( 3 ) after forming the rough layers 136 ⁇ on the through holes 136 , the surfaces of the lands 136 a of the through holes 136 are polished and flattened. Due to this, when filling the resin filler in the through holes 136 , it is possible to prevent the resin filler 154 from flowing out along the rough layers (anchors) formed on the lands 136 a of the thorough holes 136 . It is, therefore, possible to form the filler 154 in the through holes flat and to enhance the reliability of wirings above the through holes to be formed in a step described later.
- the resin filler 154 mainly consisting of an epoxy resin is applied onto the both sides of the substrate 130 and dried. Namely, through this step, the resin filler 154 is filled between the lower conductor circuits 134 (FIG. 15 (B)).
- the resin filler 154 it is preferable to employ one selected from a mixture of an epoxy resin and organic filler, a mixture of an epoxy resin and inorganic filler and a mixture of an epoxy resin and inorganic fiber.
- the resin filler in the first embodiment may be employed.
- thermosetting cycloolefin resin sheets each having a thickness of 50 ⁇ m are laminated by vacuum pressing while raising a temperature to 50 to 150° C. and at a pressure of 5 kg/cm 2 to thereby provide interlayer resin insulating layers 150 each consisting of a cycloolefin resin (FIG. 16 (A)).
- the degree of vacuum during vacuum pressing is 10 mmHg.
- the resin films employed in the second embodiment may be employed instead of the above resin sheets.
- via hole openings 152 each having a diameter of 80 ⁇ m are formed on the interlayer resin insulating layers 150 through masks 151 each having a thickness of 1.2 mm and having penetrating holes 151 a formed therein, by using CO 2 gas laser at a wavelength of 10.4 ⁇ m on conditions of a beam diameter of 5 mm, a top-hat mode, a pulse width of 50 microseconds, the diameter of each hole of the masks of 0.5 mm and three shots (FIG. 16 (B)). Then, a de-smear process is performed using oxygen plasma.
- a plasma process is performed to rough the surfaces of the interlayer resin insulating layers 150 , thereby forming rough surfaces 150 ⁇ (FIG. 16 (C)).
- the plasma process is performed for two minutes while using, as inert gas, argon gas on conditions of power of 200 W, a gas pressure of 0.6 Pa and a temperature of 70° C.
- the rough surfaces may be formed by using an acid or an oxidizer.
- each Ni/Cu metal layer 148 is 0.2 ⁇ m (FIG. 16 (D)).
- Electroless copper plated films may be further formed on the layers 148 , respectively, instead of conducting sputtering.
- the Ni/Cu metal layers 148 existing below the plating resists 155 are dissolved and removed by performing etching with a solution mixture of a nitric acid, a sulfuric acid and hydrogen peroxide, thereby forming conductor circuits 145 (including via holes 146 ) each consisting of the electroplated copper film 157 and the like and having a thickness of 16 ⁇ m (FIG. 17 (B)).
- interlayer resin insulating layers 160 and conductor circuits 165 are formed further above (FIG. 17 (D)).
- solder resist composition is applied to each side of the substrate 130 to have a thickness of 20 ⁇ m and dried. Then, a photomask is closely attached to each solder resist layer 170 , exposed to ultraviolet rays, developed with a DMTG solution to thereby form openings 171 each having a diameter of 200 ⁇ m. Thereafter, a heating process is performed to harden the solder resist layers 170 to thereby provide the solder resist layers 170 each having openings 171 and having a thickness of 20 ⁇ m (FIG. 18 (A)).
- the substrate 130 having the solder resist layers 170 formed thereon is immersed in an electroless nickel plating solution to form nickel plated layers 172 each having a thickness of 5 ⁇ m in the respective openings 171 . Further, the substrate 130 is immersed in an electroless plating solution to thereby form gold plated layers 174 each having a thickness of 0.03 ⁇ m on the respective nickel plated layers 172 (FIG. 18 (B)).
- solder paste is printed on each opening 171 of the solder resist layers 170 and a reflow process is performed at 200° C. to form solder bumps 176 , thus manufacturing a printed circuit board 120 having the solder bumps 176 (FIG. 19 ).
- a printed circuit board according to the second modification is almost the same as the printed circuit board in the first embodiment described above with reference to FIGS. 1 to 6 .
- the second modification as shown in FIG. 20 (A), after rough layers (made of an alloy consisting of Cu—Ni—P) 47 are formed on via holes 46 and through holes 36 , respectively, by electroless plating, the lands 136 a of the through holes 36 on which the rough layers 47 have been formed, respectively, are polished by buffing and flattened (FIG. 20 (B)). Thereafter, resin filler 54 is filled in the through holes 36 and the via holes 46 through masks and dried (FIG. 20 (C)). By doing so, it is possible to prevent the resin filler 54 from flowing out along the rough layers 47 .
- a printed circuit board in a comparison example 5 is basically the same as the printed circuit board in the second embodiment except that the land surfaces of through holes having rough layers formed thereon, respectively, are not polished nor flattened but resin filler is filled in the through holes. The remaining conditions are the same as those in the second embodiment.
- a printed circuit board in a comparison example 6 is basically the same as the printed circuit board in the first modification of the second embodiment except that the land surfaces of through holes having rough layers formed thereon, respectively, are not polished nor flattened but resin filler is filled in the through holes. The remaining conditions are the same as those in the first modification of the second embodiment.
- a printed circuit board in a comparison example 7 is basically the same as the printed circuit board in the second modification of the second embodiment except that the land surfaces of through holes having rough layers formed thereon, respectively, are not polished nor flattened but resin filler is filled in the through holes. The remaining conditions are the same as those in the second modification of the second embodiment.
- the printed circuit boards in the second embodiment, the first modification and the second modification of the second embodiment were compared with the printed circuit boards in the comparison examples in respect of three points, i.e., the roughing method, the surface polishing of the lands of the through holes and the flow of the resin filler out of the through holes.
- the comparison result is shown in FIG. 21 .
- the resin filler flowed out along the rough layers formed on the lands of the through holes when filling the resin filler in the through holes because the surfaces of the lands of the through holes having the rough layers formed thereon, respectively, were not polished.
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Production Of Multi-Layered Print Wiring Board (AREA)
- Printing Elements For Providing Electric Connections Between Printed Circuits (AREA)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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US11/106,642 US7178234B2 (en) | 1999-10-26 | 2005-04-15 | Method of manufacturing multi-layer printed circuit board |
US11/333,228 US7795542B2 (en) | 1999-10-26 | 2006-01-18 | Multi-layer printed circuit board and method of manufacturing multi-layer printed circuit board |
US12/179,201 US7999194B2 (en) | 1999-10-26 | 2008-07-24 | Multi-layer printed circuit board and method of manufacturing multi-layer printed circuit board |
US12/560,208 US8106310B2 (en) | 1999-10-26 | 2009-09-15 | Multi-layer printed circuit board and method of manufacturing multi-layer printed circuit board |
US13/307,213 US8822839B2 (en) | 1999-10-26 | 2011-11-30 | Multi-layer printed circuit board and method of manufacturing multi-layer printed circuit board |
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
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JP30330699A JP2001127435A (ja) | 1999-10-26 | 1999-10-26 | 多層プリント配線板及び多層プリント配線板の製造方法 |
JP30330799A JP2001127436A (ja) | 1999-10-26 | 1999-10-26 | 多層プリント配線板の製造方法 |
JP30330599A JP4832621B2 (ja) | 1999-10-26 | 1999-10-26 | 多層プリント配線板 |
JP2000029988A JP2001223466A (ja) | 2000-02-08 | 2000-02-08 | プリント配線板の製造方法 |
PCT/JP2000/007037 WO2001031984A1 (fr) | 1999-10-26 | 2000-10-10 | Panneau de cablage realise en carte imprimee multicouche et procede de production |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2000/007037 A-371-Of-International WO2001031984A1 (fr) | 1999-10-26 | 2000-10-10 | Panneau de cablage realise en carte imprimee multicouche et procede de production |
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US11/106,642 Division US7178234B2 (en) | 1999-10-26 | 2005-04-15 | Method of manufacturing multi-layer printed circuit board |
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US6930258B1 true US6930258B1 (en) | 2005-08-16 |
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US09/830,963 Expired - Lifetime US6930258B1 (en) | 1999-10-26 | 2000-10-20 | Multilayer printed wiring board and method of producing multilayer printed wiring board |
US11/106,642 Expired - Lifetime US7178234B2 (en) | 1999-10-26 | 2005-04-15 | Method of manufacturing multi-layer printed circuit board |
US11/333,228 Expired - Fee Related US7795542B2 (en) | 1999-10-26 | 2006-01-18 | Multi-layer printed circuit board and method of manufacturing multi-layer printed circuit board |
US12/179,201 Expired - Fee Related US7999194B2 (en) | 1999-10-26 | 2008-07-24 | Multi-layer printed circuit board and method of manufacturing multi-layer printed circuit board |
US12/560,208 Expired - Fee Related US8106310B2 (en) | 1999-10-26 | 2009-09-15 | Multi-layer printed circuit board and method of manufacturing multi-layer printed circuit board |
US13/307,213 Expired - Fee Related US8822839B2 (en) | 1999-10-26 | 2011-11-30 | Multi-layer printed circuit board and method of manufacturing multi-layer printed circuit board |
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Application Number | Title | Priority Date | Filing Date |
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US11/106,642 Expired - Lifetime US7178234B2 (en) | 1999-10-26 | 2005-04-15 | Method of manufacturing multi-layer printed circuit board |
US11/333,228 Expired - Fee Related US7795542B2 (en) | 1999-10-26 | 2006-01-18 | Multi-layer printed circuit board and method of manufacturing multi-layer printed circuit board |
US12/179,201 Expired - Fee Related US7999194B2 (en) | 1999-10-26 | 2008-07-24 | Multi-layer printed circuit board and method of manufacturing multi-layer printed circuit board |
US12/560,208 Expired - Fee Related US8106310B2 (en) | 1999-10-26 | 2009-09-15 | Multi-layer printed circuit board and method of manufacturing multi-layer printed circuit board |
US13/307,213 Expired - Fee Related US8822839B2 (en) | 1999-10-26 | 2011-11-30 | Multi-layer printed circuit board and method of manufacturing multi-layer printed circuit board |
Country Status (8)
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US (6) | US6930258B1 (ja) |
EP (2) | EP1672970B1 (ja) |
KR (1) | KR100833723B1 (ja) |
CN (2) | CN100521868C (ja) |
DE (1) | DE60027141T2 (ja) |
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Also Published As
Publication number | Publication date |
---|---|
US7999194B2 (en) | 2011-08-16 |
EP1162867A1 (en) | 2001-12-12 |
DE60027141T2 (de) | 2006-12-28 |
CN1652662A (zh) | 2005-08-10 |
US20080283282A1 (en) | 2008-11-20 |
US20120067633A1 (en) | 2012-03-22 |
US20060191708A1 (en) | 2006-08-31 |
US7795542B2 (en) | 2010-09-14 |
DE60027141D1 (de) | 2006-05-18 |
MY129285A (en) | 2007-03-30 |
US20050189136A1 (en) | 2005-09-01 |
TWI252723B (en) | 2006-04-01 |
EP1672970A3 (en) | 2007-08-01 |
WO2001031984A1 (fr) | 2001-05-03 |
CN100521868C (zh) | 2009-07-29 |
EP1672970B1 (en) | 2011-06-08 |
EP1162867B1 (en) | 2006-04-05 |
KR20010089702A (ko) | 2001-10-08 |
MY148600A (en) | 2013-05-15 |
US8106310B2 (en) | 2012-01-31 |
CN1199536C (zh) | 2005-04-27 |
US8822839B2 (en) | 2014-09-02 |
EP1162867A4 (en) | 2004-03-24 |
EP1672970A2 (en) | 2006-06-21 |
CN1327710A (zh) | 2001-12-19 |
US7178234B2 (en) | 2007-02-20 |
US20100006328A1 (en) | 2010-01-14 |
KR100833723B1 (ko) | 2008-05-29 |
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